It's quite interesting to see the great divide between guys who assumed that they had their finger on the pulse of the American gun Owner.
I would have thought an LCP, XDS, or, Shield, myself. But perhaps, the majority of gun owners really don't look at gun forums, as mentioned by the last 2 members.
I also go by what I see being pushed in gun stores and online stores like CDNN and Buds. They have quite a variety of guns that they highlight, that I never would have even thought of. If you go by the articles written about top 5 or top 10 guns, they always seem to include, an XDS, Shield, LCP, 1 or 2 Glocks always a 19, and a 26 or 27, 17 or 23, a Kahr PM9, and an M&P 9 or 40, along with a revolver, a Kimber, and a Ruger Lc9, and a SIG-238, 938, 229, 226. Anyhow, that is what I remember seeing for the most part, but who really knows.
But here is the first one that came up when I googled it
http://concealednation.org/2014/07/the-10-best-concealed-carry-guns/3/